Definition of Composites- A composite is - "a solid material which is composed of two or more substances having different physical characteristics and in which each substance retains its identity while contributing desirable properties to the whole." (Merriam-Webster)

A common composite material is reinforced concrete. The rebar is the reinforcement, and the cement is the matrix material.

Advanced Composites- The two substances used in "Advanced Composites" are a Fiber reinforcement and a Resin matrix. These two materials are combined either in-process (wet-layup) or purchased with resin already impregnated into the fiber (prepreg).

Quatro only uses prepreg material because of the controlled consistency and performance advantages over "wet" processed materials.

Fibers, Resins, & Prepreg

1. Common Fiber Reinforcements
   • Carbon
   • Kevlar
   • Glass
2. Common Resins
   • Epoxy
   • Polyester & Vinylester
   • Cynate Esters
   • Nylon
3. Prepreg
   • Fiber is "preimpregnated" with resin
   • The resin is slightly tacky but is uncured (B-staged).
   • Material is purchased in roll form.
   • Material is cured by exposing to elevated temperatures and pressures.
   • Common forms include unitape and fabric.
   • Quatro chooses to use prepreg exclusively because the resin-to- fiber ratio is carefully controlled.
   • Material is stored in a freezer to keep the resin from "advancing".